<?php
/**
* @version $Id: str_ireplace.php 10381 2008-06-01 03:35:53Z pasamio $
* @package utf8
* @subpackage strings
*/

//---------------------------------------------------------------
/**
* UTF-8 aware alternative to str_ireplace
* Case-insensitive version of str_replace
* Note: requires utf8_strtolower
* Note: it's not fast and gets slower if $search / $replace is array
* Notes: it's based on the assumption that the lower and uppercase
* versions of a UTF-8 character will have the same length in bytes
* which is currently true given the hash table to strtolower
* @param string
* @return string
* @see http://www.php.net/str_ireplace
* @see utf8_strtolower
* @package utf8
* @subpackage strings
*/
function utf8_ireplace($search, $replace, $str, $count = NULL){

	if ( !is_array($search) ) {

		$slen = strlen($search);
		$lendif = strlen($replace) - $slen;
		if ( $slen == 0 ) {
			return $str;
		}

		$search = utf8_strtolower($search);

		$search = preg_quote($search, '/');
		$lstr = utf8_strtolower($str);
		$i = 0;
		$matched = 0;
		while ( preg_match('/(.*)'.$search.'/Us',$lstr, $matches) ) {
			if ( $i === $count ) {
				break;
			}
			$mlen = strlen($matches[0]);
			$lstr = substr($lstr, $mlen);
			$str = substr_replace($str, $replace, $matched+strlen($matches[1]), $slen);
			$matched += $mlen + $lendif;
			$i++;
		}
		return $str;

	} else {

		foreach ( array_keys($search) as $k ) {

			if ( is_array($replace) ) {

				if ( array_key_exists($k,$replace) ) {

					$str = utf8_ireplace($search[$k], $replace[$k], $str, $count);

				} else {

					$str = utf8_ireplace($search[$k], '', $str, $count);

				}

			} else {

				$str = utf8_ireplace($search[$k], $replace, $str, $count);

			}
		}
		return $str;

	}

}


